<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
<link  id="11" rel="stylesheet"  type="text/css"  href="换肤用的.css"  />
<script>
function  skin1()
{
    var  oL=document.getElementById('11');

    oL.href='换肤用的.css'
}
function  skin2()
{
    var  oL=document.getElementById('11');

    oL.href='换肤用的2.css'
}
function  skin3()
{
    var  oL=document.getElementById('11');

    oL.href='换肤用的3.css'
}
</script>
</head>
<body>

</body>
<input  type="button" value="皮肤1"  onclick="skin1()" />
<input  type="button" value="皮肤2"  onclick="skin2()" / >
<input  type="button" value="皮肤3"  onclick="skin3()" / >
</html>